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20 March, 00:16

What event occurred when the decay of strontium-90 in an igneous rock first started?

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  1. 20 March, 00:34
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    If the following graph represents the decay of strontium-90 in an igneous rock, what event occurred at 0 years on the horizontal axis?

    I have a graph with the vertical axis showing the percentage of radioactive element remaining.
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